Renewable throat-plate for sewing-machines.



To all 'whom it may. concern:

following is a speci-ficatlon'.

.dem of the United #UNITED STATES PATENT OFFICE.

ALIBEBT'H. WEIB, 0F NYAGK, NEW YORK, ABBIGNOB T0 LUCIUS N. LITTAUE, 0F y GLOVEBSVIILE, NEW YORK.

RENEWABLE THBOAT-PLATE'I'OB, 815WING-*MAGEINES.V

'Application med July ill,l

Be it knownthat I- ALBERT 'I-I. Wals, a

States, residing at N ack,.in thecounty of Rockland and State o New York, have lnvented certain new and usefullmprovements in Renewable Throat- Plates `for Sewing-Machines, of which the This f invention relates to the' throat plates of sewing. machines, one object of the invenplate 'especially yWell adapted to machines of the 'gang needle type and which'can be cheaply manufactured and readily renewed -when 1t becomes worn, without disturbing the entire late, 'and cany also be interchan ed-'wit other forms of plates usable for i'erent purposes, that is to say to ac- Commodatedierent vshapes of feed dogs or `to have the front as to guide certam plies of goods tothe portion thereof shaped so rifbt or the left asv the case-may be by means the beveled sfilate.

. roat plates as used for gang needle machinesare necessarily of a large size, several times larger thanthethroatplates as portion at the frontedge of used on ordinary machines. The manufacture of these large plates entails considerableV expense, since they mustbe accurately made, hardened and ground'on top and bottom so -as to be perfectly parallel Vand-flat. Thisl necessitates straightening after the harden# ing process and a, percentage of them is lost in the strarilglltex'ngprocess because of breakage. en again thoughy rthey are hardened, the needle holes soon become worn `'a' by use and the entire plate must be replaced' by Va `new one. `Thisis entirely done. away `'with inzthe present improvement, because the main throat plate may be made 4afs-usual .but without the hardenn and straightening or grinding, so that t ere are no losses in the Ymanufacimre thereof.v Moreover, '-ithas been found in practice,

4with throat plates used on gang lneedle machnes, that -when the plate is ofy considerable wide rows,

size iall on machines for stitching th'strain set up by the needles penetrating the goods has va tendency to the plate so as to interfere with the mechanism-to properly form the stitches. Especially is this 'so in certain de- Specmcation of Letten Patent.

signs of feeds where the `bars of the throat plate are delicate, because the. needles are close te one another, so that it is necessaryfor portions of the feed .dogs to extend between the needles, and therefore the .plates quickly get out of sha in use. To overcome this 4it has been t e ractice to harden and temper the plates. e diicult in doing this is that the delicate bars or t in sections of the plate become harder than the other ortions thereof, which results in considera le breakage .because the plates sometimes warp inhardening or tempering and must be straightened. Then again they break easily under the -working strain of the needles. e

To overcome these disadvantages I have provided a removable and renewable top plate vmuch smaller in' size and thickness than the main plateso that it can be manu factured cheaply, and con uentl the 4cost lof renewal is reatly redu d an the life of the plate is on errthan that of plates, as

heretofore madeV cause stilness is imparted to the plate and -offers various ad-l vantages because these top 'plates can be made to suit the various stitchin opera-` tions, that'is one substituted for tie other forspecial purposes without changing the main plate, vwhich was heretofore necessary.

In short, with this improved renewable to platethe bottom or supporting plate n Vdependent of or a se arate .pi

-. not be hardened, and as the topplate is nwears the plate and the edges. of the needle holes become rounded, and frequently when a needle breaks by accident the plate 1s damaged beyond repair. This is all obviated with my improved renewable topplate', as the top plate itself can befquickly and read-, ily renewed. Moreover, this improvedplate .gives greater strength and support `to 'the work. Another important advantage of this improvement s'that the top 'plate may be .so

` for lap seam fellin shirts, overalls, etc.

mounted as to be above the level of the cloth and slide pklates, which gives assage to the wor the stltch'ingmv .u and is of special advantage on machines ud mathe work se diversa from the fider is more on a central line with respect to .the stitching position and it also gives freedom to the work around the presser foot and 1o eed.- a

. In this -plateshave n usedextensivel?, but so far as I am aware none have o the detachable variety. Usuall such lates are .made by reducing thefthi :u o the mam around the stitching position. Others ve been madeby'forcing or bendingthe-[metal ii-wd, 1mg a hollow su 0MM-M- thereof;- both of which 'methods exproveziiet is t st theffextra thin.

, asi -tlierare late .'.mth formatlonof the f-jfsi'de thereof- 'andisnabies fee-"strand *loopen tl'l'real`- to. begplaced-ithereon: as the: fr looperf-movesabackward in'the formation bf andA formf-f ipaogsu chine as is deemed .necessary 'to illustrate loopers, the cloth plate vthe main and reewable throat plate, and also lthe slide plate in dotted lines with an attachmentapplied thereto; Fig. 2 isa detail perspective view showing the vmain throat p ate and the top plate removed therefrom; Fig. 3 is an end yview of the bottom andl top throat plate inthe directio'nof the arrow in Fig. 75 1'; an Fig. i is a bottom view .of the bottom throat plate, showin the feed slots;` l needle holes andv slots lea therefrom to perly eoperate ithrthe ooper threads v The needle holder. 1 carriesgtheneedles 2, andthe loo rs 3i' coperat-ing'with the needles in the,` ormationof ,the Stthes are car! riedby the looper carrier 4. Thecloth plate 5 is milled or `ditoreceive the .bottom throat plate 6, which issecured the cloth plate bygthf'e usual serews 7-.1 fffpreerte use ffscrswsffand- -fholeafnrfettaehing :the

tofore pins, spreader barg,.fetc.1,rhave been :fm-fili@ spreading juridftherew ey pins-erf-spreadr'jbars become 1 25 siidfwlenthy 13o :registering goed the edge thereof. It is obvious that the front edge of .these top plates may be grooved, slotted or otherwise `shaped so as to guide Athe Work or seams as the `ease may be. The 'throatplate 6 has an extending portion 21 fin rontof theneedles and is ont away, las: at E20-at each side thereof and has extendzingendsr. The removable -sl-ide plateli fate into ,the irreglaI-shaped opening formed ifoldsf and easy accessf to below? they lth; plate.

gnome fexteniing irtherhvum eat 'fone esilio i hereofsautiffurrmtrgealooperithreaistmhi 'fremimr ftp @tain tthe stmn fthe .neetie man mass rbetween itt renti fthe Hooper.

Yi5. .-A throat gphite iAevfiympriing #fa bottom platewnd' arrenewableatop; platefraise' above the atop surface jof; glebottmn hplate, Sad 'tipp anti Abottom slenig?!i'iavingl" one or more e opening-s, :each of Sad needle V.openings of the bottom plate having` a grobie extending therefrom at' one side thereof and forming a looper threadtrand retainer lto, retain the strandl so that the needle can pass between it and the looper.

6. A throat plate. comprisln a bottom plate and a renewable hardene top plate, said top and bottom,- lates having one dr more registering lnee e openings, each of therefrom at one irrga groove extending therefrom at 'one thereof and forming a looper fthread strand retainer to retain the strand so that the: needle canv pass between it and the looper.

8,'A throat plate .comprising la bottom plate and a renewable hardened top. plate smaller than said bottom late and raised above said bottom plate, sai top and-bottom plates having one ormore registering needle openings, eah of said needle openings of the bottonr plate ha side thereof and forming a looper thread strand retainer to retain the strand'so that the needlecan pass between it andthe looper.

9. A throat .plate comprising a lbottom` plate and a renewable har en ed top plate of smaller size said 'bottom raised abovesa'id Tbottom' plate, sald bottom plate andt'op plate having onel or more registering f ee ots and one o r more .registering' needle openings, .apart of each of said 4needle opemngsmhavinga groove extending therefrom at one .side thereof and forming-- a looper thread strand retainer to retain=the strand so that the needle. can pass lbetween it andthe looper. 1 A 10. A throat plate 'having a needleopening provided with agroove extending therefrom and only' artially through the plate andlfonning a ]'aeent to its underside a vlooperthread..'strand retainer. 4

11. A throat "plate having a' needle. o ening, said lplate having on; itsA undersi e a lgroove extending'f'rom said needle .opening toward the front of said plate and only 'artally through the platev and forming a 4jacent .to the. uigder'side of the .plate a looper thread strand' 'retainer. l

12.' A two-part throat ,plate having one or more needlev openings therein, each of lsaid therefrom vand needle 'openings/,having a groove extending lo'ated in one fef said plate parts and; .a looper .-gtrandk,

looper.

15..A, two-.part throat plate comprising" a a groove extending late and bottom plate, comprsih retainer to` retain the strand so .that the l needle' can pass betweena it and the looper. 13. A throat plate having at needle openlng and a groove located in said late and forming a lSaid late or vretaining a looper thread rojecting at the-.un ersi'de ofv stran so that the needle can pass between it and the looper.

14.v A throat plate` having a needle ing, vand 4meansL integrali plate to extend in the .p ane of the 'plate above the bottom'surfaoe thereof for retaining a looperthead strand' 'so. that the needle can pass between'said strand and the open'- bottom plate anda renewable to vplate havhing one4 or more registering nee leopenings'f .and feed dog openin ,and means carried by the'bottom plate or. retaining a looper 'thread strand so that the needlev can pass )between it and the looper.

16. A two-fpart throat plate eomprising a bottom plate" and .arenewable top plate hav.-

ving one ormore re ter-ing needle openings and meansloea below the underside o the top plate and above' the inderside of .the bottom plate for retaining a looper 'thread' strandand formed by. a groove at one side and extending forwardly of and communi-- cating with a needle opening.

formed inY the 17. Athroat plate comprisin a two-'part bottoni plate, .one partshi-ftab e relatively to the other and one of saidparts having a renewable top late.-

18. A throat p `ate comprising a two-part lbottom plate, one part slidable relatively to the other, the fixedpart thereof having a v renewable top late;

19. T he com nation-withthe cloth plate of a sewing machine, of a two-part bottom plate, one-.part slidable.- relatively to, the

other, the no'n-slidable part thereof having a renewable and hardened top plate raise above the bottom; plate.

20. A throat plate comprisin a 'two-part bottom plate, one part shiftab e relatively to the other and one of said parts having a renewable top plate, said top plate and bottemplate havingV one or moreneedle openings and looper thread strand retaining means. `S21. Afthroat plate comprising a two-part bottom lateeomprising a fixe plate and a 4plate slldable relatively. thereto, .the f 'xed plate having a renewable top plate, said top plate and fixed plate having one `or more taining means .communicating therewith..

" 22. A throat plate oomprislng a two-part a stationary plate and a plate slidablerf'ige atively thereto, the stationary plate having arenewable vand hardened top pl raised above it and said top plate and stationary plate having one y needle openings and'loop'er thread strand reiso 'i therewith.

23. The combination `with the cloth plate of a sewing machine, of a twoJ-.Kpart bottompla-te, one part slidable relatively to the y other part said other partv thereof having a renewable and hardened top plate raise above it, said top plate and its bottom plate having re 'sterlng feed slots and one or more nee e openings, each o f said needle opening' having communicating therewith at one side and extending forwardly thereof a groove forming a looper thread strand retaining means.

24. A throat plate having a needle opening and a groove extending partway onllyl' through the plate and commumcating w1 doplee ot this patent may be obtained for Ave cents each, by addrelsing the Commissioner of Patente,

saidrneedle opening-pianti forming a looper thread strand retainer.

25. A throat plate having a needle opening, and vmeans integrall :formed in the plate ,to extend in the p ane of the plate above the bottom surfacethereof for retaining a looper thread strand topermit the needle to looper an comprising a groove at one side of the needle opening, one o'f the walls of said groove terminating adjacent to thle 'needle opening lin a substantlally V-shaped projection.

Signed at Nyack, in the county of Rockland and State .of New York, this 15th day of July, 1915.

ALBERT H. WEIS.

Washington, D. C.

ass between said Strand and the. 

